Hello devel & translate, I just pushed the patch for bugs.koha-community.org/bugzilla3/show_bug.cgi?id=6557 . It fixes a nasty long-lasting problem, BUT will work only if your frameworks are OK. The popularity is based on biblioitems.totalissues field, that *must* be linked to 942$0 field. It's the default for MARC21 in english, I've fixed UNIMARC in french, *please* check your language/marc flavour. If the biblioitems.totalissues is not linked to 942$0, you'll get a nasty (and unclear, i've asked for a follow-up to have something more understandable): Tag "0" is not a valid tag. at /home/paul/koha.dev/koha-community//C4/Biblio.pm line 3870 *nengard* = this one will need a large/complete documentation ! -- Paul POULAIN http://www.biblibre.com Expert en Logiciels Libres pour l'info-doc Tel : (33) 4 91 81 35 08